/// <summary>
    ///  獲取serialPort
    /// </summary>
    private SerialPort   serialPort = new SerialPort();


    /// <summary>
    /// Set/Get serial baudrate
    /// 設定/獲取序列波特率 
    /// </summary>
    public override int BaudRate
    {
        get
        {
            return serialPort.BaudRate;
        }
        set
        {
            serialPort.BaudRate = value;
        }
    }

    /// <summary>
    /// Discards data from the serial driver's receive buffer.
    /// 從串列埠的接收緩衝區丟棄資料
    /// </summary>
    public override void Flush()
    {
        serialPort.DiscardInBuffer();
    }

    /// <summary>
    /// Gets a value indicating the open or closed status of the SerialPort object.
    /// 獲取一個值，該值指示序列化埠物件的開啟或關閉狀態。
    /// </summary>
    public override bool IsOpen
    {
        get
        {
            return serialPort.IsOpen;
        }
    }

    /// <summary>
    /// Opens a new serial port connection.
    /// 開啟一個新的串列埠連線
    /// </summary>
    public override void Open()
    {
        serialPort.Open();
    }

    /// <summary>
    /// Set/Get the port for communications, including but not limited to all available
    /// COM ports.
    /// 獲取或者設定串列埠埠號
    /// </summary>
    public override string PortName
    {
        get
        {
            return serialPort.PortName;
        }
        set
        {
            serialPort.PortName = value;
        }
    }

    /// <summary>
    /// Gets or sets the number of milliseconds before a time-out occurs when
    /// a read operation does not finish.
    /// 獲取或設定串列埠讀取時間
    /// </summary>
    public override int ReadTimeout
    {
        get
        {
            return serialPort.ReadTimeout;
        }
        set
        {
            serialPort.ReadTimeout = value;
        }
    }

    /// <summary>
    /// Reads a number of bytes from the SerialPort input buffer and writes those 
    /// bytes into a byte array at the specified offset.
    /// </summary>
    /// <param name="length">The number of bytes to read.</param>
    /// <param name="messageSpace">The byte array to write the input to.</param>
    /// <param name="offset">The offset in the buffer array to begin writing.</param>
    /// <returns>The number of bytes read</returns>
    /// 讀取資料
    public override int ReceiveBytes(int length, byte[] messageSpace, int offset)
    {
        return serialPort.Read(messageSpace, offset, length);
    }

    /// <summary>
    /// Writes a specified number of bytes to the serial port using data from a buffer.
    /// </summary>
    /// <param name="length">The number of bytes to write.</param>
    /// <param name="message">The byte array that contains the data to write to the port.</param>
    /// <param name="offset">The zero-based byte offset in the buffer parameter at which to begin copying bytes to the port.</param>
    /// 傳送資料
    public override void SendBytes(int length, byte[] message, int offset)
    {
        serialPort.Write(message, offset, length);
    }

    /// <summary>
    /// Closes the port connection,
    /// 關閉串列埠
    /// </summary>
    public override void Shutdown()
    {
        serialPort.Close();
    }

    /// <summary>
    /// Gets or sets the number of milliseconds before a time-out occurs when
    /// a write operation does not finish.
    /// 寫資料超時時間
    /// </summary>
    public override int WriteTimeout
    {
        get
        {
            return serialPort.WriteTimeout;
        }
        set
        {
            serialPort.WriteTimeout = value;
        }
    }